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Electrolytic Oxidation

Oxidation Basics:

Electrolytic Oxidation (In Situ Chemical Oxidation): Includes a set of chemical treatment methods designed to remove organics (and sometimes inorganics) in water by oxidation through reactions with hydroxyl radicals (·OH). Oxidation is more powerful than conventional sodium hypochlorite (bleach), the dominant form of chlorine (12% concentrated sodium hypochlorite or chlorine dioxide would be stronger).

Electronic Soft Oxidation (w/o Ozone): ESO uses standard residential current (USA and International 220v 50 cycle; 240v 50 cycle available), is converted to low D.C. voltage with low amperage on titanium electrodes. During the electrochemical oxidative process hydrogen is generated at the cathode (the negative electrode) and oxygen is generated at the anode (the positive electrode). OH hydroxyl ion, theoretical atomic oxygen (O1) and oxygen (O2) are generated within the sealed pressure line to oxidize the water. Along with benefit of oxidation the dissolved oxygen (DO) is also raised in the system. The titanium electrodes show no evidence of corrosion. During operation polarity is reversed alternating cathode and anode, allowing for self-cleaning of the electrodes. 

Benefits Electrolytic Oxidation (Ti Electrodes):

Increased DO: A high DO level in a community's municipal water supply is benefit because it makes drinking water taste better. Dissolved oxygen (DO) refers to the amount of oxygen dissolved in water and is particularly important in limnology (aquatic ecology). Oxygen comprises approximately 21% of the total gas in the atmosphere; however, it is much less available in water. The amount of oxygen water can hold depends upon temperature (more oxygen can be dissolved in colder water), pressure (more oxygen can be dissolved in water at greater pressure), and salinity (more oxygen can be dissolved in water of lower salinity). 


Conversion of calcium carbonate to calcium bi-carbonate: Hard water has a high level of calcium measured as calcium carbonate hardness which causes everything from water spots on glasses and silverware, to scale buildup on fixtures to the reduction in the lifecycle of appliances including dishwashers and hot water heaters. Electrolytic oxidation converts calcium carbonate into the soft bicarbonate form thereby eliminating the problems typically associated with hard water. Depending on the level of hardness present in the source water the need for water softening may be minimized or eliminated further reducing costs and minimizing salt pollution.

Drawbacks of Electrolytic Oxidation:

Excessively high DO levels may speed up corrosion in water pipes. For this reason, some industries use water with the least possible amount of dissolved oxygen. For example water used in very low pressure boilers have no more than 2.0 ppm of DO; most boiler plant operators try to keep oxygen levels to 0.007 ppm or less, while many industries including animal husbandry, horticulture and aquaponics/hydroponics/aquaculture benefit from a high level of DO. 

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